VBOXVERSION=`VBoxManage --version | sed -r 's/([0-9]).([0-9]).([0-9]{1,2}).*/1.2.3/'`
wget -q -N "http://download.virtualbox.org/virtualbox/$VBOXVERSION/Oracle_VM_VirtualBox_Extension_Pack-$VBOXVERSION.vbox-extpack"
VBoxManage extpack install --replace Oracle*.vbox-extpack